Does that new friend on your face need to be left alone, or can you harness the power of salicylic acid? So you’ve got a pimple. Not ideal, but not the end of the world. And as a regular reader here, it’s safe to assume you’re pretty into skincare and therefore have a medicine cabinet full of products meant for this exact situation. But a stocked skincare arsenal is only helpful if you know how and when to use each…